P43 high flame

[mcnajason]

Hi folks, This is my second year burning with my Harman P43. I'm having a issue with a high flame, and after 5-6 hours of burning a black/ sooted up glass. I'm an automotive mechanic by trade, diagnosing and complicated disassembly/reassembly are a part of my everyday life, But I am new to pellet stoves and stumped here. I've had a "pro" take a look at my stove. He stated that it was my air inlet ( a 3 inch fresh air hose ). He stated that he's never seen one installed on a Canadian stove and its only code in the US. I've since completely disconnected the hose at the back of my P43 stove. Same issue. ( Thanks for the $200 bill). The flame looks very high, and does not seem strong to me. I believe I'm looking at a rich running stove. Here is some photos of the flame running on 4.

Here is what I have done so far:
- Clean out Exhaust pipe, exhaust pipe T and insured no blockages
- Cleaned outside air pipe and insured no blockages
- Cleaned out: Full stove, burn box, all holes in burn box, under burn box, ignitor area, exhaust fan and exhaust fan passage, Cleaned ESP probe, Cleaned out Pellet Metering Slide Plate ( I followed the harman P43 owners manual and have done the full yearly service)
- Inspected Seals on the hopper lid, Glass door and lower door. All look to be O.K. (no signs of a vacuum leak from these seals)
- Replaced the ESP with new OEM Harman sensor
- Ran stove on test mode, Inspected flap on inlet air. It moves freely. Both Fans run O.K. Still re-cleaned both fans and blades once again.
- Changed between 3 brands of pellets
- Ran stove with outside air off and on. No change.

I get no fault codes, But after about 5-6 hours of burning the glass is completely black. The flame is very high on every setting. Am I missing something obvious? Any help would be greatly appreciated.

 

[SciGuy]

Did the problem start all of a sudden after cleaning the fines box that houses the slide plate? It's extremely easy to not get the cover back on correctly, and end up with a lazy flame like you have. I'vet.
done it at least twice in the past when I was certain I had it on correctly.

I'd first triple check that.

Hugh

 

[jackman]

It's hard to tell from a still image but that could be normal. Does it do the same in stove temp/constant burn or room temp mode? If you are running in room temp try moving the temperature sensor to another location. You should turn the feed rate down to 3 and burn for another day or 2.

 

[Washed-Up]

Looks a little lazy, follow what Hugh and Jackman have suggested. As for the OAK(fresh air intake) leave that hooked up, it’s good to have. Have you switched pellets? Only other thing I can think of is the combustion motor, if it’s the original 2 fan blade model, make sure it’s clean and oiled at the bearings.

 

[Harman Lover 007]

Make sure your fines box cover is securely attached and that the igniter cover on the burn pot isn’t installed upside down.

 

[mcnajason]

Thank you for the replies guys. I'm feeling a little silly. I found the issue. The grate located at the end of the exhaust was about 3/4 plugged. When I cleaned the exhaust port I slipped the end off and ran a brush through the exhaust. I did not pay much attention to the wire mesh and re-installed it. It was only on my second exhaust cleaning that a noticed the screen. I figured it was going to be something simple that I simply overlooked or missed. Oh well... Learned a lot about the stove. Much appreciate the help!